Question: What is the sister city of Mariupol since Dec 26th, 2008?
Paraphrase: From Dec 26th, 2008, which is the sister city of Mariupol?.
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q37133 p:P190 ?s . ?s ps:P190 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2008')) }